- Preheat oven to 375 degrees.- Mix the bread crumbs, grated Parmesan and oregano. - Dip each piece of eggplant in the beaten egg and then dredge in the bread crumb mixture, then place in a single layer on a baking sheet. - Cook in 375 degree oven for approximately 5-7 minutes, then flip each piece and cook for another 5-7 minutes until golden brown on both sides and tender through.- Remove baking sheet with eggplant from oven, but leave oven on. - Spoon a layer of prepared spaghetti or marinara on the bottom of a 13X9 baking dish and shake dish around to coat. - Layer into baking dish as follows: eggplant slices, mozzarella cheese, sauce, until you've used everything up, ending with a layer of cheese. - Cook in a 375 degree oven until golden brown on top, about 10-12 minutes. - Serve over prepared spaghetti with additional sauce, if desired.